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If I may ask? Your charge coil is really a capacitor & silicon controlled rectifier for switching thresh hold voltage for the ign coil? Not trying to make a statement, but see if I understand the electronics correctly or am I all wet here? Please anyone & Thank you. Jeff, Seems to me all is needed is to ground the gate terminal of the scr. Correct? No?
Jeff, the "charge coil" is just a simple single coil winding that develops about 150 volts AC when the flywheel magnets pass by. This voltage is sent to the powerpack, rectified, then stored in the powerpack’s capacitor. The sensor(s) tell the powerpack when and to what cylinder/coil to send this primary voltage stored in the capacitor.
The OMC term "charge coil" is understandably confused with 12 volt alternator function, but it has nothing to do with that system, there is a separate winding for the alternator (if equipped).
The SCRs that you refer to are located inside the powerpack and are controlled by the sensor(s) telling the powerpack when and what cylinder/coil to release the voltage stored in the powerpack’s capacitor.